openssl/ssl/s2_srvr.c - Issue 2072073002: Delete bundled copy of OpenSSL and replace with README.

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Issue 2072073002: Delete bundled copy of OpenSSL and replace with README. (Closed) Base URL: https://chromium.googlesource.com/chromium/deps/openssl@master

Patch Set: Delete bundled copy of OpenSSL and replace with README. Created 4 years, 6 months ago

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1 /* ssl/s2_srvr.c */

2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

3 * All rights reserved.

4 *

5 * This package is an SSL implementation written

6 * by Eric Young (eay@cryptsoft.com).

7 * The implementation was written so as to conform with Netscapes SSL.

8 *

9 * This library is free for commercial and non-commercial use as long as

10 * the following conditions are aheared to. The following conditions

11 * apply to all code found in this distribution, be it the RC4, RSA,

12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation

13 * included with this distribution is covered by the same copyright terms

14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

15 *

16 * Copyright remains Eric Young's, and as such any Copyright notices in

17 * the code are not to be removed.

18 * If this package is used in a product, Eric Young should be given attribution

19 * as the author of the parts of the library used.

20 * This can be in the form of a textual message at program startup or

21 * in documentation (online or textual) provided with the package.

22 *

23 * Redistribution and use in source and binary forms, with or without

24 * modification, are permitted provided that the following conditions

25 * are met:

26 * 1. Redistributions of source code must retain the copyright

27 * notice, this list of conditions and the following disclaimer.

28 * 2. Redistributions in binary form must reproduce the above copyright

29 * notice, this list of conditions and the following disclaimer in the

30 * documentation and/or other materials provided with the distribution.

31 * 3. All advertising materials mentioning features or use of this software

32 * must display the following acknowledgement:

33 * "This product includes cryptographic software written by

34 * Eric Young (eay@cryptsoft.com)"

35 * The word 'cryptographic' can be left out if the rouines from the library

36 * being used are not cryptographic related :-).

37 * 4. If you include any Windows specific code (or a derivative thereof) from

38 * the apps directory (application code) you must include an acknowledgement:

39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

40 *

41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

51 * SUCH DAMAGE.

52 *

53 * The licence and distribution terms for any publically available version or

54 * derivative of this code cannot be changed. i.e. this code cannot simply be

55 * copied and put under another distribution licence

56 * [including the GNU Public Licence.]

57 */

58 /* ====================================================================

59 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.

60 *

61 * Redistribution and use in source and binary forms, with or without

62 * modification, are permitted provided that the following conditions

63 * are met:

64 *

65 * 1. Redistributions of source code must retain the above copyright

66 * notice, this list of conditions and the following disclaimer.

67 *

68 * 2. Redistributions in binary form must reproduce the above copyright

69 * notice, this list of conditions and the following disclaimer in

70 * the documentation and/or other materials provided with the

71 * distribution.

72 *

73 * 3. All advertising materials mentioning features or use of this

74 * software must display the following acknowledgment:

75 * "This product includes software developed by the OpenSSL Project

76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"

77 *

78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

79 * endorse or promote products derived from this software without

80 * prior written permission. For written permission, please contact

81 * openssl-core@openssl.org.

82 *

83 * 5. Products derived from this software may not be called "OpenSSL"

84 * nor may "OpenSSL" appear in their names without prior written

85 * permission of the OpenSSL Project.

86 *

87 * 6. Redistributions of any form whatsoever must retain the following

88 * acknowledgment:

89 * "This product includes software developed by the OpenSSL Project

90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"

91 *

92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR

96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

103 * OF THE POSSIBILITY OF SUCH DAMAGE.

104 * ====================================================================

105 *

106 * This product includes cryptographic software written by Eric Young

107 * (eay@cryptsoft.com). This product includes software written by Tim

108 * Hudson (tjh@cryptsoft.com).

109 *

110 */

111

112 #include "ssl_locl.h"

113 #ifndef OPENSSL_NO_SSL2

114 #include <stdio.h>

115 #include <openssl/bio.h>

116 #include <openssl/rand.h>

117 #include <openssl/objects.h>

118 #include <openssl/evp.h>

119

120 static const SSL_METHOD *ssl2_get_server_method(int ver);

121 static int get_client_master_key(SSL *s);

122 static int get_client_hello(SSL *s);

123 static int server_hello(SSL *s);

124 static int get_client_finished(SSL *s);

125 static int server_verify(SSL *s);

126 static int server_finish(SSL *s);

127 static int request_certificate(SSL *s);

128 static int ssl_rsa_private_decrypt(CERT c, int len, unsigned char from,

129 unsigned char *to,int padding);

130 #define BREAK break

131

132 static const SSL_METHOD *ssl2_get_server_method(int ver)

133 {

134 if (ver == SSL2_VERSION)

135 return(SSLv2_server_method());

136 else

137 return(NULL);

138 }

139

140 IMPLEMENT_ssl2_meth_func(SSLv2_server_method,

141 ssl2_accept,

142 ssl_undefined_function,

143 ssl2_get_server_method)

144

145 int ssl2_accept(SSL *s)

146 {

147 unsigned long l=(unsigned long)time(NULL);

148 BUF_MEM *buf=NULL;

149 int ret= -1;

150 long num1;

151 void (cb)(const SSL ssl,int type,int val)=NULL;

152 int new_state,state;

153

154 RAND_add(&l,sizeof(l),0);

155 ERR_clear_error();

156 clear_sys_error();

157

158 if (s->info_callback != NULL)

159 cb=s->info_callback;

160 else if (s->ctx->info_callback != NULL)

161 cb=s->ctx->info_callback;

162

163 /* init things to blank */

164 s->in_handshake++;

165 if (!SSL_in_init(s) \|\| SSL_in_before(s)) SSL_clear(s);

166

167 if (s->cert == NULL)

168 {

169 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET);

170 return(-1);

171 }

172

173 clear_sys_error();

174 for (;;)

175 {

176 state=s->state;

177

178 switch (s->state)

179 {

180 case SSL_ST_BEFORE:

181 case SSL_ST_ACCEPT:

182 case SSL_ST_BEFORE\|SSL_ST_ACCEPT:

183 case SSL_ST_OK\|SSL_ST_ACCEPT:

184

185 s->server=1;

186 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);

187

188 s->version=SSL2_VERSION;

189 s->type=SSL_ST_ACCEPT;

190

191 buf=s->init_buf;

192 if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))

193 { ret= -1; goto end; }

194 if (!BUF_MEM_grow(buf,(int)

195 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))

196 { ret= -1; goto end; }

197 s->init_buf=buf;

198 s->init_num=0;

199 s->ctx->stats.sess_accept++;

200 s->handshake_func=ssl2_accept;

201 s->state=SSL2_ST_GET_CLIENT_HELLO_A;

202 BREAK;

203

204 case SSL2_ST_GET_CLIENT_HELLO_A:

205 case SSL2_ST_GET_CLIENT_HELLO_B:

206 case SSL2_ST_GET_CLIENT_HELLO_C:

207 s->shutdown=0;

208 ret=get_client_hello(s);

209 if (ret <= 0) goto end;

210 s->init_num=0;

211 s->state=SSL2_ST_SEND_SERVER_HELLO_A;

212 BREAK;

213

214 case SSL2_ST_SEND_SERVER_HELLO_A:

215 case SSL2_ST_SEND_SERVER_HELLO_B:

216 ret=server_hello(s);

217 if (ret <= 0) goto end;

218 s->init_num=0;

219 if (!s->hit)

220 {

221 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;

222 BREAK;

223 }

224 else

225 {

226 s->state=SSL2_ST_SERVER_START_ENCRYPTION;

227 BREAK;

228 }

229 case SSL2_ST_GET_CLIENT_MASTER_KEY_A:

230 case SSL2_ST_GET_CLIENT_MASTER_KEY_B:

231 ret=get_client_master_key(s);

232 if (ret <= 0) goto end;

233 s->init_num=0;

234 s->state=SSL2_ST_SERVER_START_ENCRYPTION;

235 BREAK;

236

237 case SSL2_ST_SERVER_START_ENCRYPTION:

238 /* Ok we how have sent all the stuff needed to

239 * start encrypting, the next packet back will

240 * be encrypted. */

241 if (!ssl2_enc_init(s,0))

242 { ret= -1; goto end; }

243 s->s2->clear_text=0;

244 s->state=SSL2_ST_SEND_SERVER_VERIFY_A;

245 BREAK;

246

247 case SSL2_ST_SEND_SERVER_VERIFY_A:

248 case SSL2_ST_SEND_SERVER_VERIFY_B:

249 ret=server_verify(s);

250 if (ret <= 0) goto end;

251 s->init_num=0;

252 if (s->hit)

253 {

254 /* If we are in here, we have been

255 * buffering the output, so we need to

256 * flush it and remove buffering from

257 * future traffic */

258 s->state=SSL2_ST_SEND_SERVER_VERIFY_C;

259 BREAK;

260 }

261 else

262 {

263 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;

264 break;

265 }

266

267 case SSL2_ST_SEND_SERVER_VERIFY_C:

268 /* get the number of bytes to write */

269 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);

270 if (num1 > 0)

271 {

272 s->rwstate=SSL_WRITING;

273 num1=BIO_flush(s->wbio);

274 if (num1 <= 0) { ret= -1; goto end; }

275 s->rwstate=SSL_NOTHING;

276 }

277

278 /* flushed and now remove buffering */

279 s->wbio=BIO_pop(s->wbio);

280

281 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;

282 BREAK;

283

284 case SSL2_ST_GET_CLIENT_FINISHED_A:

285 case SSL2_ST_GET_CLIENT_FINISHED_B:

286 ret=get_client_finished(s);

287 if (ret <= 0)

288 goto end;

289 s->init_num=0;

290 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A;

291 BREAK;

292

293 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:

294 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:

295 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:

296 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:

297 /* don't do a 'request certificate' if we

298 * don't want to, or we already have one, and

299 * we only want to do it once. */

300 if (!(s->verify_mode & SSL_VERIFY_PEER) \|\|

301 ((s->session->peer != NULL) &&

302 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))

303 {

304 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;

305 break;

306 }

307 else

308 {

309 ret=request_certificate(s);

310 if (ret <= 0) goto end;

311 s->init_num=0;

312 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;

313 }

314 BREAK;

315

316 case SSL2_ST_SEND_SERVER_FINISHED_A:

317 case SSL2_ST_SEND_SERVER_FINISHED_B:

318 ret=server_finish(s);

319 if (ret <= 0) goto end;

320 s->init_num=0;

321 s->state=SSL_ST_OK;

322 break;

323

324 case SSL_ST_OK:

325 BUF_MEM_free(s->init_buf);

326 ssl_free_wbio_buffer(s);

327 s->init_buf=NULL;

328 s->init_num=0;

329 /* ERR_clear_error();*/

330

331 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);

332

333 s->ctx->stats.sess_accept_good++;

334 /* s->server=1; */

335 ret=1;

336

337 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);

338

339 goto end;

340 /* BREAK; */

341

342 default:

343 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE);

344 ret= -1;

345 goto end;

346 /* BREAK; */

347 }

348

349 if ((cb != NULL) && (s->state != state))

350 {

351 new_state=s->state;

352 s->state=state;

353 cb(s,SSL_CB_ACCEPT_LOOP,1);

354 s->state=new_state;

355 }

356 }

357 end:

358 s->in_handshake--;

359 if (cb != NULL)

360 cb(s,SSL_CB_ACCEPT_EXIT,ret);

361 return(ret);

362 }

363

364 static int get_client_master_key(SSL *s)

365 {

366 int is_export,i,n,keya,ek;

367 unsigned long len;

368 unsigned char *p;

369 const SSL_CIPHER *cp;

370 const EVP_CIPHER *c;

371 const EVP_MD *md;

372

373 p=(unsigned char *)s->init_buf->data;

374 if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)

375 {

376 i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);

377

378 if (i < (10-s->init_num))

379 return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));

380 s->init_num = 10;

381

382 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)

383 {

384 if (p[-1] != SSL2_MT_ERROR)

385 {

386 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

387 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WR ONG_PACKET_TYPE);

388 }

389 else

390 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_E RROR);

391 return(-1);

392 }

393

394 cp=ssl2_get_cipher_by_char(p);

395 if (cp == NULL)

396 {

397 ssl2_return_error(s,SSL2_PE_NO_CIPHER);

398 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATC H);

399 return(-1);

400 }

401 s->session->cipher= cp;

402

403 p+=3;

404 n2s(p,i); s->s2->tmp.clear=i;

405 n2s(p,i); s->s2->tmp.enc=i;

406 n2s(p,i);

407 if(i > SSL_MAX_KEY_ARG_LENGTH)

408 {

409 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

410 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LO NG);

411 return -1;

412 }

413 s->session->key_arg_length=i;

414 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;

415 }

416

417 /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */

418 p=(unsigned char *)s->init_buf->data;

419 if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)

420 {

421 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

422 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);

423 return -1;

424 }

425 keya=s->session->key_arg_length;

426 len = 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.e nc + (unsigned long)keya;

427 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)

428 {

429 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

430 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_MESSAGE_TOO_LONG);

431 return -1;

432 }

433 n = (int)len - s->init_num;

434 i = ssl2_read(s,(char *)&(p[s->init_num]),n);

435 if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));

436 if (s->msg_callback)

437 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_call back_arg); /* CLIENT-MASTER-KEY */

438 p += 10;

439

440 memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),

441 (unsigned int)keya);

442

443 if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)

444 {

445 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

446 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);

447 return(-1);

448 }

449 i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,

450 &(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),

451 (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);

452

453 is_export=SSL_C_IS_EXPORT(s->session->cipher);

454

455 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL,NULL))

456 {

457 ssl2_return_error(s,SSL2_PE_NO_CIPHER);

458 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER _FUNCTIONS);

459 return(0);

460 }

461

462 if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)

463 {

464 is_export=1;

465 ek=8;

466 }

467 else

468 ek=5;

469

470 /* bad decrypt */

471 #if 1

472 /* If a bad decrypt, continue with protocol but with a

473 * random master secret (Bleichenbacher attack) */

474 if ((i < 0) \|\|

475 ((!is_export && (i != EVP_CIPHER_key_length(c)))

476 \|\| (is_export && ((i != ek) \|\| (s->s2->tmp.clear+(unsigned int)i !=

477 (unsigned int)EVP_CIPHER_key_length(c))))))

478 {

479 ERR_clear_error();

480 if (is_export)

481 i=ek;

482 else

483 i=EVP_CIPHER_key_length(c);

484 if (RAND_pseudo_bytes(p,i) <= 0)

485 return 0;

486 }

487 #else

488 if (i < 0)

489 {

490 error=1;

491 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);

492 }

493 /* incorrect number of key bytes for non export cipher */

494 else if ((!is_export && (i != EVP_CIPHER_key_length(c)))

495 \|\| (is_export && ((i != ek) \|\| (s->s2->tmp.clear+i !=

496 EVP_CIPHER_key_length(c)))))

497 {

498 error=1;

499 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BIT S);

500 }

501 if (error)

502 {

503 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

504 return(-1);

505 }

506 #endif

507

508 if (is_export) i+=s->s2->tmp.clear;

509

510 if (i > SSL_MAX_MASTER_KEY_LENGTH)

511 {

512 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

513 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);

514 return -1;

515 }

516 s->session->master_key_length=i;

517 memcpy(s->session->master_key,p,(unsigned int)i);

518 return(1);

519 }

520

521 static int get_client_hello(SSL *s)

522 {

523 int i,n;

524 unsigned long len;

525 unsigned char *p;

526 STACK_OF(SSL_CIPHER) cs; / a stack of SSL_CIPHERS */

527 STACK_OF(SSL_CIPHER) cl; / the ones we want to use */

528 STACK_OF(SSL_CIPHER) prio, allow;

529 int z;

530

531 /* This is a bit of a hack to check for the correct packet

532 * type the first time round. */

533 if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)

534 {

535 s->first_packet=1;

536 s->state=SSL2_ST_GET_CLIENT_HELLO_B;

537 }

538

539 p=(unsigned char *)s->init_buf->data;

540 if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)

541 {

542 i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);

543 if (i < (9-s->init_num))

544 return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));

545 s->init_num = 9;

546

547 if (*(p++) != SSL2_MT_CLIENT_HELLO)

548 {

549 if (p[-1] != SSL2_MT_ERROR)

550 {

551 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

552 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_P ACKET_TYPE);

553 }

554 else

555 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);

556 return(-1);

557 }

558 n2s(p,i);

559 if (i < s->version) s->version=i;

560 n2s(p,i); s->s2->tmp.cipher_spec_length=i;

561 n2s(p,i); s->s2->tmp.session_id_length=i;

562 n2s(p,i); s->s2->challenge_length=i;

563 if ( (i < SSL2_MIN_CHALLENGE_LENGTH) \|\|

564 (i > SSL2_MAX_CHALLENGE_LENGTH))

565 {

566 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

567 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LE NGTH);

568 return(-1);

569 }

570 s->state=SSL2_ST_GET_CLIENT_HELLO_C;

571 }

572

573 /* SSL2_ST_GET_CLIENT_HELLO_C */

574 p=(unsigned char *)s->init_buf->data;

575 len = 9 + (unsigned long)s->s2->tmp.cipher_spec_length + (unsigned long) s->s2->challenge_length + (unsigned long)s->s2->tmp.session_id_length;

576 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)

577 {

578 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

579 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_MESSAGE_TOO_LONG);

580 return -1;

581 }

582 n = (int)len - s->init_num;

583 i = ssl2_read(s,(char *)&(p[s->init_num]),n);

584 if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));

585 if (s->msg_callback)

586 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_call back_arg); /* CLIENT-HELLO */

587 p += 9;

588

589 /* get session-id before cipher stuff so we can get out session

590 * structure if it is cached */

591 /* session-id */

592 if ((s->s2->tmp.session_id_length != 0) &&

593 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))

594 {

595 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

596 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);

597 return(-1);

598 }

599

600 if (s->s2->tmp.session_id_length == 0)

601 {

602 if (!ssl_get_new_session(s,1))

603 {

604 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

605 return(-1);

606 }

607 }

608 else

609 {

610 i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),

611 s->s2->tmp.session_id_length, NULL);

612 if (i == 1)

613 { /* previous session */

614 s->hit=1;

615 }

616 else if (i == -1)

617 {

618 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

619 return(-1);

620 }

621 else

622 {

623 if (s->cert == NULL)

624 {

625 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);

626 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICA TE_SET);

627 return(-1);

628 }

629

630 if (!ssl_get_new_session(s,1))

631 {

632 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

633 return(-1);

634 }

635 }

636 }

637

638 if (!s->hit)

639 {

640 cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,

641 &s->session->ciphers);

642 if (cs == NULL) goto mem_err;

643

644 cl=SSL_get_ciphers(s);

645

646 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)

647 {

648 prio=sk_SSL_CIPHER_dup(cl);

649 if (prio == NULL) goto mem_err;

650 allow = cs;

651 }

652 else

653 {

654 prio = cs;

655 allow = cl;

656 }

657 for (z=0; z<sk_SSL_CIPHER_num(prio); z++)

658 {

659 if (sk_SSL_CIPHER_find(allow,sk_SSL_CIPHER_value(prio,z) ) < 0)

660 {

661 (void)sk_SSL_CIPHER_delete(prio,z);

662 z--;

663 }

664 }

665 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)

666 {

667 sk_SSL_CIPHER_free(s->session->ciphers);

668 s->session->ciphers = prio;

669 }

670 /* s->session->ciphers should now have a list of

671 * ciphers that are on both the client and server.

672 * This list is ordered by the order the client sent

673 * the ciphers or in the order of the server's preference

674 * if SSL_OP_CIPHER_SERVER_PREFERENCE was set.

675 */

676 }

677 p+=s->s2->tmp.cipher_spec_length;

678 /* done cipher selection */

679

680 /* session id extracted already */

681 p+=s->s2->tmp.session_id_length;

682

683 /* challenge */

684 if (s->s2->challenge_length > sizeof s->s2->challenge)

685 {

686 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

687 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);

688 return -1;

689 }

690 memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);

691 return(1);

692 mem_err:

693 SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);

694 return(0);

695 }

696

697 static int server_hello(SSL *s)

698 {

699 unsigned char p,d;

700 int n,hit;

701

702 p=(unsigned char *)s->init_buf->data;

703 if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)

704 {

705 d=p+11;

706 (p++)=SSL2_MT_SERVER_HELLO; / type */

707 hit=s->hit;

708 *(p++)=(unsigned char)hit;

709 #if 1

710 if (!hit)

711 {

712 if (s->session->sess_cert != NULL)

713 /* This can't really happen because get_client_h ello

714 * has called ssl_get_new_session, which does no t set

715 * sess_cert. */

716 ssl_sess_cert_free(s->session->sess_cert);

717 s->session->sess_cert = ssl_sess_cert_new();

718 if (s->session->sess_cert == NULL)

719 {

720 SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE) ;

721 return(-1);

722 }

723 }

724 /* If 'hit' is set, then s->sess_cert may be non-NULL or NULL,

725 * depending on whether it survived in the internal cache

726 * or was retrieved from an external cache.

727 * If it is NULL, we cannot put any useful data in it anyway,

728 * so we don't touch it.

729 */

730

731 #else /* That's what used to be done when cert_st and sess_cert_st were

732 * the same. */

733 if (!hit)

734 { /* else add cert to session */

735 CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);

736 if (s->session->sess_cert != NULL)

737 ssl_cert_free(s->session->sess_cert);

738 s->session->sess_cert=s->cert;

739 }

740 else /* We have a session id-cache hit, if the

741 * session-id has no certificate listed against

742 * the 'cert' structure, grab the 'old' one

743 * listed against the SSL connection */

744 {

745 if (s->session->sess_cert == NULL)

746 {

747 CRYPTO_add(&s->cert->references,1,

748 CRYPTO_LOCK_SSL_CERT);

749 s->session->sess_cert=s->cert;

750 }

751 }

752 #endif

753

754 if (s->cert == NULL)

755 {

756 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);

757 SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED );

758 return(-1);

759 }

760

761 if (hit)

762 {

763 (p++)=0; / no certificate type */

764 s2n(s->version,p); /* version */

765 s2n(0,p); /* cert len */

766 s2n(0,p); /* ciphers len */

767 }

768 else

769 {

770 /* EAY EAY */

771 /* put certificate type */

772 *(p++)=SSL2_CT_X509_CERTIFICATE;

773 s2n(s->version,p); /* version */

774 n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);

775 s2n(n,p); /* certificate length */

776 i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);

777 n=0;

778

779 /* lets send out the ciphers we like in the

780 * prefered order */

781 n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d,0);

782 d+=n;

783 s2n(n,p); /* add cipher length */

784 }

785

786 /* make and send conn_id */

787 s2n(SSL2_CONNECTION_ID_LENGTH,p); /* add conn_id length */

788 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;

789 if (RAND_pseudo_bytes(s->s2->conn_id,(int)s->s2->conn_id_length) <= 0)

790 return -1;

791 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);

792 d+=SSL2_CONNECTION_ID_LENGTH;

793

794 s->state=SSL2_ST_SEND_SERVER_HELLO_B;

795 s->init_num=d-(unsigned char *)s->init_buf->data;

796 s->init_off=0;

797 }

798 /* SSL2_ST_SEND_SERVER_HELLO_B */

799 /* If we are using TCP/IP, the performance is bad if we do 2

800 * writes without a read between them. This occurs when

801 * Session-id reuse is used, so I will put in a buffering module

802 */

803 if (s->hit)

804 {

805 if (!ssl_init_wbio_buffer(s,1)) return(-1);

806 }

807

808 return(ssl2_do_write(s));

809 }

810

811 static int get_client_finished(SSL *s)

812 {

813 unsigned char *p;

814 int i, n;

815 unsigned long len;

816

817 p=(unsigned char *)s->init_buf->data;

818 if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)

819 {

820 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);

821 if (i < 1-s->init_num)

822 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));

823 s->init_num += i;

824

825 if (*p != SSL2_MT_CLIENT_FINISHED)

826 {

827 if (*p != SSL2_MT_ERROR)

828 {

829 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

830 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRON G_PACKET_TYPE);

831 }

832 else

833 {

834 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERRO R);

835 /* try to read the error message */

836 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->ini t_num);

837 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY, i);

838 }

839 return(-1);

840 }

841 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;

842 }

843

844 /* SSL2_ST_GET_CLIENT_FINISHED_B */

845 if (s->s2->conn_id_length > sizeof s->s2->conn_id)

846 {

847 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

848 SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);

849 return -1;

850 }

851 len = 1 + (unsigned long)s->s2->conn_id_length;

852 n = (int)len - s->init_num;

853 i = ssl2_read(s,(char *)&(p[s->init_num]),n);

854 if (i < n)

855 {

856 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));

857 }

858 if (s->msg_callback)

859 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg ); /* CLIENT-FINISHED */

860 p += 1;

861 if (memcmp(p,s->s2->conn_id,s->s2->conn_id_length) != 0)

862 {

863 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

864 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFEREN T);

865 return(-1);

866 }

867 return(1);

868 }

869

870 static int server_verify(SSL *s)

871 {

872 unsigned char *p;

873

874 if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)

875 {

876 p=(unsigned char *)s->init_buf->data;

877 *(p++)=SSL2_MT_SERVER_VERIFY;

878 if (s->s2->challenge_length > sizeof s->s2->challenge)

879 {

880 SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR);

881 return -1;

882 }

883 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length) ;

884 /* p+=s->s2->challenge_length; */

885

886 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;

887 s->init_num=s->s2->challenge_length+1;

888 s->init_off=0;

889 }

890 return(ssl2_do_write(s));

891 }

892

893 static int server_finish(SSL *s)

894 {

895 unsigned char *p;

896

897 if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)

898 {

899 p=(unsigned char *)s->init_buf->data;

900 *(p++)=SSL2_MT_SERVER_FINISHED;

901

902 if (s->session->session_id_length > sizeof s->session->session_i d)

903 {

904 SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR);

905 return -1;

906 }

907 memcpy(p,s->session->session_id, (unsigned int)s->session->sessi on_id_length);

908 /* p+=s->session->session_id_length; */

909

910 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;

911 s->init_num=s->session->session_id_length+1;

912 s->init_off=0;

913 }

914

915 /* SSL2_ST_SEND_SERVER_FINISHED_B */

916 return(ssl2_do_write(s));

917 }

918

919 /* send the request and check the response */

920 static int request_certificate(SSL *s)

921 {

922 const unsigned char *cp;

923 unsigned char p,p2,*buf2;

924 unsigned char *ccd;

925 int i,j,ctype,ret= -1;

926 unsigned long len;

927 X509 *x509=NULL;

928 STACK_OF(X509) *sk=NULL;

929

930 ccd=s->s2->tmp.ccl;

931 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)

932 {

933 p=(unsigned char *)s->init_buf->data;

934 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;

935 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;

936 if (RAND_pseudo_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0)

937 return -1;

938 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);

939

940 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;

941 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;

942 s->init_off=0;

943 }

944

945 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)

946 {

947 i=ssl2_do_write(s);

948 if (i <= 0)

949 {

950 ret=i;

951 goto end;

952 }

953

954 s->init_num=0;

955 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;

956 }

957

958 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)

959 {

960 p=(unsigned char *)s->init_buf->data;

961 i=ssl2_read(s,(char )&(p[s->init_num]),6-s->init_num); / try t o read 6 octets ... */

962 if (i < 3-s->init_num) /* ... but don't call ssl2_part_read now if we got at least 3

963 * (probably NO-CERTIFICATE-ERROR) */

964 {

965 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);

966 goto end;

967 }

968 s->init_num += i;

969

970 if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR))

971 {

972 n2s(p,i);

973 if (i != SSL2_PE_NO_CERTIFICATE)

974 {

975 /* not the error message we expected -- let ssl2 _part_read handle it */

976 s->init_num -= 3;

977 ret = ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE , 3);

978 goto end;

979 }

980

981 if (s->msg_callback)

982 s->msg_callback(0, s->version, 0, p, 3, s, s->ms g_callback_arg); /* ERROR */

983

984 /* this is the one place where we can recover from an SS L 2.0 error */

985

986 if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)

987 {

988 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);

989 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_ NOT_RETURN_A_CERTIFICATE);

990 goto end;

991 }

992 ret=1;

993 goto end;

994 }

995 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) \|\| (s->init_num < 6))

996 {

997 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);

998 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);

999 goto end;

1000 }

1001 if (s->init_num != 6)

1002 {

1003 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR);

1004 goto end;

1005 }

1006

1007 /* ok we have a response */

1008 /* certificate type, there is only one right now. */

1009 ctype= *(p++);

1010 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)

1011 {

1012 ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE );

1013 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGU MENT);

1014 goto end;

1015 }

1016 n2s(p,i); s->s2->tmp.clen=i;

1017 n2s(p,i); s->s2->tmp.rlen=i;

1018 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;

1019 }

1020

1021 /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */

1022 p=(unsigned char *)s->init_buf->data;

1023 len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rle n;

1024 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)

1025 {

1026 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_MESSAGE_TOO_LONG);

1027 goto end;

1028 }

1029 j = (int)len - s->init_num;

1030 i = ssl2_read(s,(char *)&(p[s->init_num]),j);

1031 if (i < j)

1032 {

1033 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);

1034 goto end;

1035 }

1036 if (s->msg_callback)

1037 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg ); /* CLIENT-CERTIFICATE */

1038 p += 6;

1039

1040 cp = p;

1041 x509=(X509 *)d2i_X509(NULL,&cp,(long)s->s2->tmp.clen);

1042 if (x509 == NULL)

1043 {

1044 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);

1045 goto msg_end;

1046 }

1047

1048 if (((sk=sk_X509_new_null()) == NULL) \|\| (!sk_X509_push(sk,x509)))

1049 {

1050 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);

1051 goto msg_end;

1052 }

1053

1054 i=ssl_verify_cert_chain(s,sk);

1055

1056 if (i > 0) /* we like the packet, now check the chksum */

1057 {

1058 EVP_MD_CTX ctx;

1059 EVP_PKEY *pkey=NULL;

1060

1061 EVP_MD_CTX_init(&ctx);

1062 if (!EVP_VerifyInit_ex(&ctx,s->ctx->rsa_md5, NULL)

1063 \|\| !EVP_VerifyUpdate(&ctx,s->s2->key_material,

1064 s->s2->key_material_length)

1065 \|\| !EVP_VerifyUpdate(&ctx,ccd,

1066 SSL2_MIN_CERT_CHALLENGE_LENGTH))

1067 goto msg_end;

1068

1069 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);

1070 buf2=OPENSSL_malloc((unsigned int)i);

1071 if (buf2 == NULL)

1072 {

1073 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);

1074 goto msg_end;

1075 }

1076 p2=buf2;

1077 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);

1078 if (!EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i))

1079 {

1080 OPENSSL_free(buf2);

1081 goto msg_end;

1082 }

1083 OPENSSL_free(buf2);

1084

1085 pkey=X509_get_pubkey(x509);

1086 if (pkey == NULL) goto end;

1087 i=EVP_VerifyFinal(&ctx,cp,s->s2->tmp.rlen,pkey);

1088 EVP_PKEY_free(pkey);

1089 EVP_MD_CTX_cleanup(&ctx);

1090

1091 if (i > 0)

1092 {

1093 if (s->session->peer != NULL)

1094 X509_free(s->session->peer);

1095 s->session->peer=x509;

1096 CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);

1097 s->session->verify_result = s->verify_result;

1098 ret=1;

1099 goto end;

1100 }

1101 else

1102 {

1103 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);

1104 goto msg_end;

1105 }

1106 }

1107 else

1108 {

1109 msg_end:

1110 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);

1111 }

1112 end:

1113 sk_X509_free(sk);

1114 X509_free(x509);

1115 return(ret);

1116 }

1117

1118 static int ssl_rsa_private_decrypt(CERT c, int len, unsigned char from,

1119 unsigned char *to, int padding)

1120 {

1121 RSA *rsa;

1122 int i;

1123

1124 if ((c == NULL) \|\| (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))

1125 {

1126 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);

1127 return(-1);

1128 }

1129 if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)

1130 {

1131 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA );

1132 return(-1);

1133 }

1134 rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;

1135

1136 /* we have the public key */

1137 i=RSA_private_decrypt(len,from,to,rsa,padding);

1138 if (i < 0)

1139 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);

1140 return(i);

1141 }

1142 #else /* !OPENSSL_NO_SSL2 */

1143

1144 # if PEDANTIC

1145 static void *dummy=&dummy;

1146 # endif

1147

1148 #endif

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